The operator of any establishment shall require all employees of such establishment to have a health examination by a physician or physician assistant and a certified health certificate for each employee shall be kept on file by the operator. The secretary may at any time require an employee of an establishment to submit to a health examination by a physician or physician assistant. No person suffering from any communicable disease, including any communicable skin disease, and no person with infected wounds, and no person who is a “carrier” of a communicable disease shall be employed in any capacity in an establishment. No person shall work or be employed in or about any establishment during the time in which a communicable disease exists in the home in which such person resides unless such person has obtained a certificate from a physician or physician assistant to the effect that no danger of public contagion or infection will result from the employment of such person in such establishment. Every person employed by an establishment and engaged in direct physical contact with meat or poultry products during its preparation, processing, or storage, shall be clean in person, wear clean washable outer garments and a suitable cap or other head covering used exclusively in such work. Only persons specifically designated by the operator of an establishment shall be permitted to touch meat or poultry products with their hands, and the persons so designated shall keep their hands scrupulously clean.